diffuse nebula
Definition
- Noun:
- A type of nebula: A diffuse nebula is an astronomical object consisting of a cloud of interstellar gas and dust that is illuminated by the light from nearby or embedded stars. Unlike planetary nebulae, it lacks a sharply defined shape and appears as a glowing, often irregular, cloud in space.
Usage Examples
- Noun:
- The Orion Nebula is a famous example of a diffuse nebula.
- Astronomers study diffuse nebulae to understand star formation.
Advanced Usage
- Scientific Context: In astrophysics, the term is used to distinguish these large, glowing clouds from other nebular types like dark nebulae (which block light) or planetary nebulae (which are shells of gas ejected from dying stars).
- The study focused on the chemical composition of the diffuse nebula.
Variants and Related Words
- Emission nebula: A type of diffuse nebula that glows due to the ionization of its gas by ultraviolet light from hot stars.
- Reflection nebula: A type of diffuse nebula that shines by reflecting the light of nearby stars.
- Nebula (n.): The general term for any cloud of gas and dust in interstellar space.
Synonyms
- Bright nebula: A general synonym often used for diffuse nebulae that are visible due to emitted or reflected light.
Related Phrases
- H II region: A specific type of emission (diffuse) nebula associated with areas of active star formation.
- The Tarantula Nebula is a massive H II region.
Noun
-
a cluster of stars within an intricate cloud of gas and dust
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